We Tested Seven TSA Compliant Liquids Bags. The Best One Costs 18 Cents. Reviews by Wirecutter Carry On Liquid Size Allowed On A Plane When traveling by air, it is crucial for passengers to pay close attention to the liquid rules for carry on luggage. Adhering to these regulations ensures a smooth and efficient security screening process Can You Take Vapes on a Plane? Travelling with Vapes OK Vape Perfectly Packed: How to Pack Liquids to Carry On the Plane Suitcase Confidential Hello, flying home today, reading mixed things. Anyone flown home recently, did you have to separate liquids in a clear bag?